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SuperNOVAS v1.5
The NOVAS C library, made better
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SuperNOVAS v1.5
The NOVAS C library, made better
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Functions to define and use different astronomical timescales and to convert among them. More...
Functions | |
| double | get_ut1_to_tt (int leap_seconds, double dut1) |
| Returns the TT - UT1 time difference given the leap seconds and the actual UT1 - UTC time difference as measured and published by IERS. | |
| double | get_utc_to_tt (int leap_seconds) |
| Returns the difference between Terrestrial Time (TT) and Universal Coordinated Time (UTC) | |
| double | novas_clock_skew (const novas_frame *frame, enum novas_timescale timescale) |
| Returns the instantaneous incremental rate at which the observer's clock (i.e. | |
| double | novas_date (const char *restrict date) |
| Returns a Julian date (in non-specific timescale) corresponding the specified input string date / time. | |
| double | novas_date_scale (const char *restrict date, enum novas_timescale *restrict scale) |
| Returns a Julian date and the timescale corresponding the specified input string date/time and timescale marker. | |
| double | novas_diff_tcb (const novas_timespec *t1, const novas_timespec *t2) |
| Returns the Barycentric Coordinate Time (TCB) based time difference (t1 - t2) in days between two astronomical time specifications. | |
| double | novas_diff_tcg (const novas_timespec *t1, const novas_timespec *t2) |
| Returns the Geocentric Coordinate Time (TCG) based time difference (t1 - t2) in days between two astronomical time specifications. | |
| double | novas_diff_time (const novas_timespec *t1, const novas_timespec *t2) |
| Returns the Terrestrial Time (TT) based time difference (t1 - t2) in days between two astronomical time specifications. | |
| double | novas_get_split_time (const novas_timespec *restrict time, enum novas_timescale timescale, long *restrict ijd) |
| Returns the fractional Julian date of an astronomical time in the specified timescale, as an integer and fractional part. | |
| double | novas_get_time (const novas_timespec *restrict time, enum novas_timescale timescale) |
| Returns the fractional Julian date of an astronomical time in the specified timescale. | |
| time_t | novas_get_unix_time (const novas_timespec *restrict time, long *restrict nanos) |
| Returns the UNIX time for an astronomical time instant. | |
| int | novas_iso_timestamp (const novas_timespec *restrict time, char *restrict dst, int maxlen) |
| Prints a UTC-based ISO timestamp to millisecond precision to the specified string buffer. | |
| double | novas_mean_clock_skew (const novas_frame *frame, enum novas_timescale timescale) |
| Returns the averaged incremental rate at which the observer's clock (i.e. | |
| int | novas_offset_time (const novas_timespec *time, double seconds, novas_timespec *out) |
| Increments the astrometric time by a given amount. | |
| int | novas_print_timescale (enum novas_timescale scale, char *restrict buf) |
| Prints the standard string representation of the timescale to the specified buffer. | |
| int | novas_set_current_time (int leap, double dut1, novas_timespec *restrict time) |
| Sets the time eith the UNIX time obtained from the system clock. | |
| int | novas_set_split_time (enum novas_timescale timescale, long ijd, double fjd, int leap, double dut1, novas_timespec *restrict time) |
| Sets an astronomical time to the split Julian Date value, defined in the specified timescale. | |
| int | novas_set_str_time (enum novas_timescale timescale, const char *restrict str, int leap, double dut1, novas_timespec *restrict time) |
| Sets astronomical time in a specific timescale using a string specification. | |
| int | novas_set_time (enum novas_timescale timescale, double jd, int leap, double dut1, novas_timespec *restrict time) |
| Sets an astronomical time to the fractional Julian Date value, defined in the specified timescale. | |
| int | novas_set_unix_time (time_t unix_time, long nanos, int leap, double dut1, novas_timespec *restrict time) |
| Sets an astronomical time to a UNIX time value. | |
| double | novas_time_gst (const novas_timespec *restrict time, enum novas_accuracy accuracy) |
| Returns the Greenwich (apparent) Sidereal Time (GST/GaST) for a given astronomical time specification. | |
| double | novas_time_lst (const novas_timespec *restrict time, double lon, enum novas_accuracy accuracy) |
| Returns the Local (apparent) Sidereal Time (LST/LaST) for a given astronomical time specification and observer location. | |
| int | novas_timestamp (const novas_timespec *restrict time, enum novas_timescale scale, char *restrict dst, int maxlen) |
| Prints an astronomical timestamp to millisecond precision in the specified timescale to the specified string buffer. | |
| int | tdb2tt (double jd_tdb, double *restrict jd_tt, double *restrict secdiff) |
| Computes the Terrestrial Time (TT) based Julian date corresponding to a Barycentric Dynamical Time (TDB) Julian date, and retuns th TDB-TT time difference also. | |
| double | tt2tdb (double jd_tt) |
| Returns the TDB - TT time difference in seconds for a given TT or TDB date, with a maximum error of 10 μs for dates between 1600 and 2200. | |
| double | tt2tdb_fp (double jd_tt, double limit) |
| Returns the TDB-TT time difference with flexible precision. | |
| double | tt2tdb_hp (double jd_tt) |
| Returns the TDB-TT time difference with high precision. | |
Functions to define and use different astronomical timescales and to convert among them.
1.13.2